The oxidation of alloying elements during the ESR of stainless steel has been studied. The model previously developed by WEI and Mitchell for the chemical reactions and mass transfer processes during ESR was applied t...The oxidation of alloying elements during the ESR of stainless steel has been studied. The model previously developed by WEI and Mitchell for the chemical reactions and mass transfer processes during ESR was applied to the remelting of the high Cr steel 1Cr18Ni9(Ti).The laboratory data for the unsteady state A.C.ESR were analyzed and dealt with by the model.When the remelting process reached a steady state,an oxidant(Fe_2O_3 powder)or a deoxidant(Ca-Si powder or metallic Ca)was added to the slag bath.The results showed that this model is applicable to the remelting of stainless steel rather precisely, and it is expected that the model may offer a reliable basis for the control of composition during practical ESR of high alloy steel. Also,the oxidation of Cr in the steel must be noticed when its content is high;but it is entirely possible to adjust the Cr content of ingot within a considerable range,using a special technique by means of the slag-metal reactions during the remelting.展开更多
Electroslag remelting (ESR) process using consumable electrode deoxidized with Ca-Si and Fe-Si instead of Al, and acid slag (CaF_2SiO_2Al_2O_3CaO) instead of universal slag ANF_6(CaF_2. 70 %+A1_2O_3.30 %) could change...Electroslag remelting (ESR) process using consumable electrode deoxidized with Ca-Si and Fe-Si instead of Al, and acid slag (CaF_2SiO_2Al_2O_3CaO) instead of universal slag ANF_6(CaF_2. 70 %+A1_2O_3.30 %) could change brittle inclusion (alumina) to ductile inclusion (silicate) in remelted steel. Fatigue life of bearing steel could be increased significantly in this way.展开更多
The residual aluminum content has a great influence upon CrNiMoV steel properties and the optimal content is about 0.010%. The aluminum control during the ESR process has been investigated in this paper. All experimen...The residual aluminum content has a great influence upon CrNiMoV steel properties and the optimal content is about 0.010%. The aluminum control during the ESR process has been investigated in this paper. All experiments were car ried out in a 20 kg ESR furnace. The results show that when a 60%CaF_2-30%Al_2O_3-5%SiO_2-5%CaO slag system and proper deoxidizing schedule is used, a reasonable ingot with optimal aluminum contents can be obtained. Silicon and magnesium contents are approximately the same with those in the electrode.展开更多
对钢厂6 t电弧炉+LF+VOD+3 t ESR生产的40 mm×40 mm^80 mm×80 mm X20Cr13不锈钢方钢棒材(/%:0.17~0.22C,0.30~0.80Mn,0.10~0.50Si,0.30~0.80Ni,12.5~14.0Cr)随机抽取89炉次,进行化学成分与力学性能的统计回归分析,得到了该类...对钢厂6 t电弧炉+LF+VOD+3 t ESR生产的40 mm×40 mm^80 mm×80 mm X20Cr13不锈钢方钢棒材(/%:0.17~0.22C,0.30~0.80Mn,0.10~0.50Si,0.30~0.80Ni,12.5~14.0Cr)随机抽取89炉次,进行化学成分与力学性能的统计回归分析,得到了该类钢材成分与其力学性能的定量回归关系式:σ_s=704.9+121.9[Ni]-84.9[Mn];σ_b=638.7+51.1[Ni]-40.5[Mn]+16.9[Cr];A=81.8-24.8[C]+2.7[Mn]-4.4[Cr];Z=49.4+47.5[C]+4.8[Si]+4.3[Ni];A_(KV)=-90.8-55.8[Mn]+10.2[Cr]+154.1[Si]。如工艺参数和棒材规格等因素改变时,应重新回归分析,修正方程系数。展开更多
34CrNiMo6钢(/%:0.30~0.38C,0.50~0.80Mn,≤0.40Si,0.015~0.035S,≤0.035P,1.30~1.70Ni,1.30~1.70Cr,0.15~0.30Mo)的冶金流程为30 t EAF-LF-VD-浇铸Φ470 mm电极-3.6 t ESR锭(Φ610 mm)-锻成Φ280 mm棒材。在分析冶炼过程中影响钢中B类...34CrNiMo6钢(/%:0.30~0.38C,0.50~0.80Mn,≤0.40Si,0.015~0.035S,≤0.035P,1.30~1.70Ni,1.30~1.70Cr,0.15~0.30Mo)的冶金流程为30 t EAF-LF-VD-浇铸Φ470 mm电极-3.6 t ESR锭(Φ610 mm)-锻成Φ280 mm棒材。在分析冶炼过程中影响钢中B类夹杂物级别因素的基础上,通过将电极氧含量从20×10^(-6)降至11×10^(-6)、同时电极S含量由0.035%提高到0.045%,进而减少重熔过程FeS等附加剂的添加量,将萤石-Al_2O_3-SiO_2-MgO重熔渣系中萤石由45%提高到60%及SiO_2由15%降低到5%等措施,生产钢材的B类夹杂物级别由原先的2.5级降至≤1.5级,并且钢中硫分布均匀适中,保证了电渣钢的质量。展开更多
文摘The oxidation of alloying elements during the ESR of stainless steel has been studied. The model previously developed by WEI and Mitchell for the chemical reactions and mass transfer processes during ESR was applied to the remelting of the high Cr steel 1Cr18Ni9(Ti).The laboratory data for the unsteady state A.C.ESR were analyzed and dealt with by the model.When the remelting process reached a steady state,an oxidant(Fe_2O_3 powder)or a deoxidant(Ca-Si powder or metallic Ca)was added to the slag bath.The results showed that this model is applicable to the remelting of stainless steel rather precisely, and it is expected that the model may offer a reliable basis for the control of composition during practical ESR of high alloy steel. Also,the oxidation of Cr in the steel must be noticed when its content is high;but it is entirely possible to adjust the Cr content of ingot within a considerable range,using a special technique by means of the slag-metal reactions during the remelting.
文摘Electroslag remelting (ESR) process using consumable electrode deoxidized with Ca-Si and Fe-Si instead of Al, and acid slag (CaF_2SiO_2Al_2O_3CaO) instead of universal slag ANF_6(CaF_2. 70 %+A1_2O_3.30 %) could change brittle inclusion (alumina) to ductile inclusion (silicate) in remelted steel. Fatigue life of bearing steel could be increased significantly in this way.
文摘The residual aluminum content has a great influence upon CrNiMoV steel properties and the optimal content is about 0.010%. The aluminum control during the ESR process has been investigated in this paper. All experiments were car ried out in a 20 kg ESR furnace. The results show that when a 60%CaF_2-30%Al_2O_3-5%SiO_2-5%CaO slag system and proper deoxidizing schedule is used, a reasonable ingot with optimal aluminum contents can be obtained. Silicon and magnesium contents are approximately the same with those in the electrode.
文摘对钢厂6 t电弧炉+LF+VOD+3 t ESR生产的40 mm×40 mm^80 mm×80 mm X20Cr13不锈钢方钢棒材(/%:0.17~0.22C,0.30~0.80Mn,0.10~0.50Si,0.30~0.80Ni,12.5~14.0Cr)随机抽取89炉次,进行化学成分与力学性能的统计回归分析,得到了该类钢材成分与其力学性能的定量回归关系式:σ_s=704.9+121.9[Ni]-84.9[Mn];σ_b=638.7+51.1[Ni]-40.5[Mn]+16.9[Cr];A=81.8-24.8[C]+2.7[Mn]-4.4[Cr];Z=49.4+47.5[C]+4.8[Si]+4.3[Ni];A_(KV)=-90.8-55.8[Mn]+10.2[Cr]+154.1[Si]。如工艺参数和棒材规格等因素改变时,应重新回归分析,修正方程系数。
文摘34CrNiMo6钢(/%:0.30~0.38C,0.50~0.80Mn,≤0.40Si,0.015~0.035S,≤0.035P,1.30~1.70Ni,1.30~1.70Cr,0.15~0.30Mo)的冶金流程为30 t EAF-LF-VD-浇铸Φ470 mm电极-3.6 t ESR锭(Φ610 mm)-锻成Φ280 mm棒材。在分析冶炼过程中影响钢中B类夹杂物级别因素的基础上,通过将电极氧含量从20×10^(-6)降至11×10^(-6)、同时电极S含量由0.035%提高到0.045%,进而减少重熔过程FeS等附加剂的添加量,将萤石-Al_2O_3-SiO_2-MgO重熔渣系中萤石由45%提高到60%及SiO_2由15%降低到5%等措施,生产钢材的B类夹杂物级别由原先的2.5级降至≤1.5级,并且钢中硫分布均匀适中,保证了电渣钢的质量。
